ISIS also took a border crossing into Syria on Saturday, amid reports indicating another crossing into Syria.

Sunni tribesmen have taken a border crossing in Jordan to stop it falling to ISIS.

Further pressure to oil prices on Monday came from China, as a report indicated increased output from its manufacturing sector.

HSBC's monthly China manufacturing survey showed activity expanded for the first time this year, indicating that the slowdown in the country's economy is bottoming out, which would lead to increased energy demand.